"Absolute Value and Negative Numbers" PPT courseware 2

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"Absolute Value and Negative Numbers" PPT courseware 2

Test your skills: Name the following meanings and simplify them:

(1)ㄧ2.3ㄧ=______ ,ㄧ7/4ㄧ=______ , ㄧ6ㄧ=______

(2)ㄧ-5ㄧ=______ ,ㄧ-10.5ㄧ=______ , ㄧ-7/4ㄧ=______

The opposite of -5 is

The opposite of -10.5 is

The opposite of -7/4 is

(3)ㄧ0ㄧ=______, the opposite of 0 is ______

Think about it: What does the absolute value of a number have to do with the number itself or its opposite?

practice

1. Fill in the blanks:

The symbol of (1)-2/5 is ______, and the absolute value is ______;

(2) The symbol of 10.5 is ______, and the absolute value is ______;

(3) The number with absolute value 3/7 is ______;

(4) The number whose absolute value is 9 is ______;

(5) The number with an absolute value of 0.37 is ______;

2. Compare the sizes of the following groups of numbers:

(1)-12.3___-12 (2)-(-2.75)___-(-2.67)

(3)�-8�___-8 (4)-�-0.4�___-(-0.4)

3. The rational numbers a and b are as shown in the figure on the number axis. Use >, = or < to fill in the blanks.

(1) a____b , (2) |a|___|b| ,

(3)–a___-b, (4)|a|___a ,

(5) |b|____b

4. If |x|=|-2.5|, then x=______

5. There are ____ integers whose absolute value is less than 3, and the smallest one is ____

summary:

1. The absolute value of a positive number is ______, the absolute value of a negative number is ______, and the absolute value of 0 is ______.

2.The absolute value of a number is ______ number.

3. For two positive numbers, ____________ is big, but for two negative numbers, ______ is small.

4.�a�= a (when a is a positive number or 0)

-a (a is a positive number or 0)

practice

2. Decide whether the following statements are correct.

(1) If the absolute value of a number is 4, then the number is -4.

(2)|3|>0.

(3)|-1.3|>0.

(4) The absolute value of a rational number must be a positive number.

(5) If a=-b, then |a|=|b|.

(6) If |a|=|b|, then a=b.

(7) If |a|=-a, then a must be a negative number.

(8) The absolute values ​​of two numbers that are opposite to each other are equal.

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For more information about the "Absolute Value and Opposite Numbers" PPT courseware, please click on the Absolute Value and Opposite Numbers ppt tab.

"Absolute Value and Negative Numbers" PPT courseware:

"Absolute Value and Negative Numbers" PPT courseware Geometric meaning of absolute value On the number axis, the distance from the point representing a number to the origin is called the absolute value of the number. Teacher-student cooperation will test you and test your ability. What are the similarities and differences between the following sets of numbers? Please tell me...

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Update Time: 2024-12-11

This template belongs to Mathematics courseware Hebei Education Edition Seventh Grade Mathematics Volume 1 industry PPT template

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